Caterpillar original  266-4387 Diesel Engine Fuel Injector 20R-1277 230-3255 386-1752 for C3500 3508 3512 3516 5130B 5230B Construction Machinery original new injector

Engineered for demanding heavy-duty operations, the Original Caterpillar CAT 3512B Fuel Injector 266-4387 is an OEM replacement component designed for CAT 3500 series diesel engines. Manufactured from high-strength alloy steel, this injector delivers precision fuel metering, excellent spray pattern, and stable fuel delivery under high-pressure and high-temperature conditions. The nozzle atomizes fuel into microscopic droplets, ensuring efficient combustion across continuous-duty stationary, marine propulsion, and prime power applications including CAT 3508, 3508B, 3512, 3512B, 3516, 3516B, 3524, and 3524B engine platforms commonly found in generator sets, mining trucks, oilfield equipment, and construction machinery.

This fuel injector assembly provides broad cross-reference compatibility with part numbers 386-1772, 392-0220, 20R-1281, 250-1311, 373-4087, 376-0509, and 392-0212, simplifying fleet maintenance and inventory management. Its advanced design supports low fuel consumption, high durability, corrosion resistance, and extended service life, reducing total cost of ownership. The injector integrates seamlessly with the engine ECM, which calculates engine speed, load, fuel demand, and operating temperature to command precise fuel delivery at optimal timing for reliable performance in mining, marine, power generation, and oil & gas sectors.

Proper installation and maintenance ensure long-term reliability. Operators should use clean diesel fuel, replace filters regularly, avoid water contamination, monitor fuel pressure, and inspect injector operation periodically. Installation steps include cleaning the injector mounting bore, removing contaminants, installing new seals, fitting the injector to Caterpillar specifications, tightening with correct torque values, connecting fuel lines, bleeding the fuel system, performing a leak test, and verifying engine operation. Common fault indicators such as black smoke, white smoke, power loss, or hard starting typically signal nozzle wear, injector leakage, blockage, or low injection pressure, allowing timely corrective action.